I cannot tell you which one...
I cannot tell you which one, but I can give you some clues to help - whatever weakens your faith, whatever stops you from "going", whatever distracts you from accepting responsibilities, whatever causes you to be self-centered, whatever makes you unable to hear the message and confess the truth whatever forces you to "escape", whatever causes you to rationalize for the sake of convenience, whatever makes you blind and deaf ...
You are in the position of Ibrahim whose weakness was in his love for Ismail (his son). He was teased by Satan. Imagine yourself at the peak of honor, full of pride and there is only ONE THING for which you can give up everything and sacrifice any other love for its love. THAT IS YOUR ISMAIL! Your Ismail can be a person, an object, a rank, a position or even a "weakness"! But - for Ibrahim it was his son!
Toward the end of his life, Ibrahim witnessed a century of struggle, movement, homelessness, fighting in Holy Wars confrontation with the ignorance of his tribe, oppression of Nimrod and the fanaticism of idol worshippers. While intelligent and rebellious, he spent his youth in the house of a fanatic idol-worshipper and idol-maker (Azar). His barren wife Sara was a fanatic aristocrat. Ibrahim undertook the difficult task of being a prophet of monotheism within an oppressive system.
In that age of darkness, he tolerated a century of torture and created an awareness and love for freedom in a people who were so used to oppression. Ibrahim got old and lonely. At the height of his prophecy he remained a "man", yet, as any other human being, he wished to have a son. His wife was infertile and he was more than a hundred years old. He was wishful, but not hopeful. Allah rewarded the old man for the time he spent and the suffering he experienced while propagating, "His message".
He blessed him with a son (Ismail) from his maid, Hajar. She was a black woman who was not "honorable" enough to create jealousy in the heart of his first wife, Sara. Ismail was not only a son for his father. He was the result of a whole life's expectation, the reward for a life full of struggle. The only son of an old father, he was the most dear after all those miserable years.
For Ibrahim, Ismail was his son, but your Ismail may be "you", your family, your job, your wealth, your fame...How do I know? For Ibrahim, it was his son; such a son for such a father.